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2 years ago

What value of x makes this equation true? 25 = -7 + x

Mathematics

2 answers:

Brut [27]2 years ago

4 0

Answer:

x=32 makes this equation true

Step-by-step explanation:

Well first we have to solve this to see-

25=-7+x Add 7 to both sides to get x by itself

+7 +7 Adding 7 to -7 makes it 0 so it goes away

32=x This is our final answer

krok68 [10]2 years ago

4 0

X=32

Flip it x=-7-25

calculate the difference

-x=-32

Change the signs of the equation

X=32

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Two passenger train, A and B, 450 km apart, star to move toward each other at the same time and meet after 2hours.

likoan [24]

Let $v$ be the speed of train A, and let's set the origin in the initial position of train A. The equations of motion are

$\begin{cases}s_A(t) = vt\\s_B(t) = -\dfrac{8}{7}vt+450\end{cases}$

where $s_A,\ s_B$ are the positions of trains A and B respectively, and t is the time in hours.

The two trains meet if and only if $s_A=s_B$ , and we know that this happens after two hours, i.e. at $t=2$

$\begin{cases}s_A(2) = 2v\\s_B(2) = -\dfrac{16}{7}v+450\end{cases}\implies 2v = -\dfrac{16}{7}v+450$

Solving this equation for v we have

$2v = -\dfrac{16}{7}v+450 \iff \dfrac{30}{7}v=450 \iff v=\dfrac{450\cdot 7}{30} = 105$

So, train A is travelling at 105 km/h. This implies that train B travels at

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5 0

2 years ago

Find the area. simply your answer 2x 3x

Firdavs [7]

The area of a triangle is always:

A=bh/2 (base times the height divided by 2)

A=3x(2x)/2

A=6x^2/2

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7 0

2 years ago

Read 2 more answers

Simplify to the extent possible: (logx16)(log2 x)

olga55 [171]

Answer:

Step-by-step explanation:

Use the change-of-base rule.

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2 years ago

Nathan has a collection of 220 baseball cards. He lets his brother 1/4 of his collection and sells 20% of his collection to the

tatyana61 [14]

Answer:

The baseball cards remain in Nathan’s collection is 106 cards

Explanation:

Total number of cards Nathan has= 220

Number of cards he let his brother have = 1/4 of his collection

= $\frac{1}{4} \times 220$ = 55 cards

Number of cards he sells = 20% of his collection

= $\frac{20}{100} \times 220$

=44 cards

No of cards he gives to his friends=15 cards

Remaining cards = total number of cards – (no of cards he gave to his brother+ cards he sold+ cards he gave to this friends)

= 220 – ( 55+44+15)

=220-114

=106 cards

baseball cards remain in Nathan’s collection is 106 cards

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2 years ago

What is the answer to number 14??

son4ous [18]

Zero has one square root which is 0.
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3 years ago